The four screenshots you had presented come from a mod by Tosyk, which will replace all original Mafia vehicles with newer, HQ ones. Although, it's still work in progress.
The photo gallery on flickr is made by Hipo1990 (most of his mods is already in the downloads), but I'm afraid that he may be inactive these days.
As a consolation, have a look here:
http://www.mafiastory.ru/index.php?option=com_content&view=category&layout=blog&id=12&Itemid=13
There are a few car models, which would fit into your mod perfectly.

Yes i already got these models (i registrate to the mafia-game.ru there are 9 finished cars now , just the cop car (Schuber Six cop) and the Ford T and the Bolt B Delivery (3. picture) aaand the Schubert Six (the 4th picture) remains ... I can't wait for these ... but at last i know the truth behind these mods